From acc168d13e166cd3275bdfd5b6fce8b0bd677e49 Mon Sep 17 00:00:00 2001
From: myve <forge@myve.lan>
Date: Sun, 28 Sep 2025 11:41:07 +0000
Subject: [PATCH] Add environment option to filter rejected emails

---
 .env                                          |  3 +++
 .../run/docker-entrypoint/init.d/70-reject.sh | 22 ++++++++++++++-----
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/.env b/.env
index b44966c..e8e6f0a 100644
--- a/.env
+++ b/.env
@@ -31,6 +31,9 @@ MYVEMAIL_BLACKLIST_DOMAINS=
 # Blacklist invididual email addresses (eg. email@website.tld,email2@website2.tld2)
 MYVEMAIL_BLACKLIST_EMAILS=
 
+# Filter rejected email updates from a pattern separated by commas
+MYVEMAIL_REJECT_FILTER=
+
 # Volumes
 MYVEMAIL_VOLUME_MARIADB=
 MYVEMAIL_VOLUME_SSL=
diff --git a/build/run/docker-entrypoint/init.d/70-reject.sh b/build/run/docker-entrypoint/init.d/70-reject.sh
index 8fb4d86..81abe42 100755
--- a/build/run/docker-entrypoint/init.d/70-reject.sh
+++ b/build/run/docker-entrypoint/init.d/70-reject.sh
@@ -1,14 +1,24 @@
 #!/usr/bin/env bash
+# Check filters
+unset filters
+if [ ${MYVEMAIL_REJECT_FILTER} ]
+then
+	filters+=(${MYVEMAIL_REJECT_FILTER//,/ })
+fi
+
 # Notify if rejected emails were found
 while true
 do
 	bash -c 'tail -n +0 --pid=$$ -f /var/log/mail/maillog.debug* | grep --line-buffered -F -v -f /var/log/mail/reject.log | { sed "/NOQUEUE: reject/q" && kill $$ ;}'
 	grep -h "NOQUEUE: reject" /var/log/mail/maillog.debug* | grep -F -v -f /var/log/mail/reject.log >>/var/log/mail/reject.log
-	cat <<- mail | sendmail reject@${MYVEMAIL_DOMAIN}
-	From: reject@${MYVEMAIL_DOMAIN}
-	To: reject@${MYVEMAIL_DOMAIN}
-	Subject: Rejected email found
+	if ! tail -n 1 /var/log/mail/reject.log | grep -i -q "$(printf '%s\|' ${filters[@]:-impossible-string-that-would-never-be-grepped} | sed 's|\\\|$||')"
+	then
+		cat <<- mail | sendmail reject@${MYVEMAIL_DOMAIN}
+		From: reject@${MYVEMAIL_DOMAIN}
+		To: reject@${MYVEMAIL_DOMAIN}
+		Subject: Rejected email found
 
-	$(tail -n 1 /var/log/mail/reject.log)
-	mail
+		$(tail -n 1 /var/log/mail/reject.log)
+		mail
+	fi
 done >/dev/null &